I am running a JV1080 and a Roland MC505 Groove Box via Studio Vision on my Mac. I have the JV running fine but when I add the 505 into the picture I get both modules playing a tone simultaneously. Unfortunately OMS doesn't have the 505 "driver" listed as a default in it's device manager so I just added it as an "untitled" device. Is it because I don't have the drivers or because I need to reconfigure my cabling (somehow using the "Thru" MIDI feature). I know this is a very simple cluts question to which I'm sure there is an easy answer, but it would be appreciated. email - daz69_@hotmail.com